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首页> 外文期刊>Semiconductors >On the Band Gap and Thermal Expansion of MnIn_(5.0)S_(8.5) Single Crystals
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On the Band Gap and Thermal Expansion of MnIn_(5.0)S_(8.5) Single Crystals

机译:MnIn_(5.0)S_(8.5)单晶的带隙和热膨胀

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MnIn_(5.0)S_(8.5) single crystals are grown by the Bridgman method. The width and length of the crystals are ~14 and ~40 mm, respectively. The composition, structure and unit-cell parameter of the crystals are established. From the transmittance spectra recorded in the temperature range 20-300 K, the band gap E_g and its temperature dependence E_g(T) are determined. The dependence E_g(T) is adequately described by the corresponding theoretical expression. The specific expansion (Δl/l_0) versus temperature is measured, and the coefficient of linear thermal expansion (α_L) is determined. From the data on α_L, the Debye temperature (Θ_D) and the rms dynamic atomic displacements (u~2~(1/2)) are calculated. It is established that the Debye temperature ΘD decreases with increasing temperature, whereas the rms atomic displacements increase.
机译:通过Bridgman方法生长MnIn_(5.0)S_(8.5)单晶。晶体的宽度和长度分别为〜14和〜40 mm。确定了晶体的组成,结构和晶胞参数。根据在20-300 K温度范围内记录的透射光谱,确定带隙E_g及其温度依赖性E_g(T)。依赖关系E_g(T)由相应的理论表达式充分描述。测量相对膨胀率(Δl/ l_0)与温度的关系,并确定线性热膨胀系数(α_L)。根据α_L上的数据,计算了德拜温度(Θ_D)和均方根动态原子位移(u〜2〜(1/2))。可以确定的是,德拜温度ΘD随着温度的升高而降低,而有效值原子位移增加。

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